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extract-i18n.js
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166 lines (131 loc) · 4 KB
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/* eslint-disable import/no-extraneous-dependencies */
/* eslint-disable import/no-dynamic-require */
/* eslint-disable no-console */
/* eslint-disable no-continue */
const chalk = require('chalk');
const glob = require('glob');
const fs = require('fs');
const babylon = require('babylon');
const i18nConfig = require('./../package.json').i18n;
const report = message => {
console.log(message);
};
const extractFromSource = config => {
const messages = {};
config.sourcePath.forEach(source => {
const files = glob.sync(`${source}/**/*.js`, { debug: false });
files.forEach(file => {
for (let i = 0; i < config.ignorePath.length; i++) {
if (file.indexOf(config.ignorePath[i]) !== -1) {
return;
}
}
const contents = fs.readFileSync(file).toString();
const tokens = babylon.parse(contents, {
sourceType: 'module',
plugins: ['jsx', 'classProperties', 'objectRestSpread', 'flow'],
}).tokens;
let counter = 0;
for (let i = 0; i < tokens.length; i++) {
const token = tokens[i];
if (token.type.label === 'name' && token.value === config.translator) {
const parenthesis = tokens[i + 1];
const message = tokens[i + 2];
if (!parenthesis || parenthesis.type.label !== '(') {
continue;
}
if (!message || message.type.label !== 'string') {
continue;
}
if (messages[message.value] === '') {
continue;
}
counter += 1;
messages[message.value] = '';
}
}
report(
` - parsing ${chalk.bold(file)} .. ${chalk.bold(
counter
)} strings found!`
);
});
});
return messages;
};
const generateFiles = (config, messages) => {
report('Generating translations:');
let exports = '/* eslint-disable quote-props */\nexport default {\n';
config.languages.forEach(language => {
const filepath = `${process.cwd()}/${config.messagePath}/${language}.js`;
let oldMessages = {};
try {
oldMessages = require(filepath);
} catch (e) {
console.log(e);
}
const action =
oldMessages && oldMessages.length === 0 ? 'generated' : 'merged';
// Get a fresh copy of found strings
const newMessages = { ...messages };
if (language === config.sourceLanguage) {
Object.keys(newMessages).forEach(key => {
newMessages[key] = key;
});
}
// Iterate on old strings
Object.keys(oldMessages).forEach(key => {
if (typeof newMessages[key] !== 'undefined') {
// Translation needed & found: copy it
if (oldMessages[key] !== '') {
newMessages[key] = oldMessages[key];
}
} else if (typeof oldMessages[key] === 'object') {
// old syntax, copy blindly
newMessages[key] = oldMessages[key];
} else {
// Translation old & gone: surround it with @
newMessages[key] = `@${oldMessages[key].replace(/^@+|@+$/g, '')}@`;
}
});
const ordered = {};
Object.keys(newMessages)
.sort()
.forEach(key => {
ordered[key] = newMessages[key];
});
// Write the new message file
fs.writeFile(
filepath,
`module.exports = ${JSON.stringify(ordered, null, 2)};`,
'utf8',
err => {
if (err) throw err;
}
);
report(` - ${action} ${chalk.bold(filepath)}`);
exports += ` '${language}': require('./${language}'),\n`;
});
exports += '};\n';
fs.writeFile(
`${process.cwd()}/${config.messagePath}/index.js`,
exports,
'utf8',
err => {
if (err) throw err;
}
);
};
const extractMessages = config => {
report(
`Extracting messages in ${chalk.green(
config.sourcePath
)} using ${chalk.green(config.translator)}()`
);
const messages = extractFromSource(config);
report('Done parsing\n');
generateFiles(config, messages);
report('Done, have fun translating!\n'); // Et voilà!
return true;
};
extractMessages(i18nConfig);